Hi Terry, Got a dumb question - how did you connect it up to your existing lines without the use of the prop valve?
Im thinking of getting a few master cylinder sizes from the wrecker and trialling them out to find the "best" one - which couple of sizes would you suggest I should pick up? Thanks Andrew > BlankMark, > > No problem, ask away as I'm happy to educate/inform if I can. > > The bias is determined in the master cylinder and it even varies by brand > even for the same size. eg Nabco has a slightly different built in bias than > Tokico as has Sankyo etc etc. It's done by the valving and springs in the > cylinder. Dual cylinders are designed to be used with a prop valve and this > is your problem. I got lucky on my street 1600, I had a 3/4" Tokico that > decided it didn't want to work no more and I'd lent my spare out. OK, off to > the JY for something to keep me going and reluctantly I bought a smick Sunny > 13/16" Nabco - same fittings except for the prop valve, so I left it off - > it was only going to be temporary right. Turns out that this cylinder is far > superior for my setup without the prop valve, and 2 years on I'm still > running it and the other cylinder and prop valve is still in the spares box. > I tell the story to illustrate that there's no way that unless you run > exactly the same components as me that I could guarantee you'll get the same > result - it just don't work like that with brakes. > > What a prop valve does is alter the front/rear pressure by blocking the rear > pressure - unless you have a sophisticated tilton type then the stock > production valves don't even increase the pressure to the front for the same > pedal pressure. > > All that a booster does is use manifold vacuum to lessen the pedal pressure > (effort) required to move the fluid from the master cylinder onto the slave > cylinders - it does nothing more and nothing less. > > I suggest you have a read of this article - it contains some American terms > but you'll work out what they are talking about eg prop valve is called a > combination valve in US. Some of the stuff about how hydraulic systems work > is a bit basic but it will tell you how a change of master cylinder bore > diameter affects the force applied to a slave. > > http://www.howstuffworks.com/brake1.htm > > regards > Terry > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Mark O'Conner > Sent: Thursday, 30 May 2002 8:36 AM > To: [EMAIL PROTECTED] > Subject: Re: Brake Booster > > > Terry, > > Sorry to be harping on this subject, but can you explain to me - is it the > booster or master that affects bias? > > If its the master cylinder, then with the previously mentioned setup what > master would you suggest so as to eliminate the bias. > > > Mark > ----- Original Message ----- > From: Terry Rudd > To: [EMAIL PROTECTED] > Sent: Thursday, May 30, 2002 1:21 AM > Subject: RE: Brake Booster > > > Mark, > > That combo would have very similar piston diameter to the 180SX so I > think 15/16" cylinder would be a good one to start with. It's always a bit > hit & miss when you migrate brakes but it's going to be close. Sunny booster > is fine, should be nice stoppers when you get them sorted. If you're lucky > you wont need a prop valve, but it's no biggy to fit one. My feeling is that > you'll need one as the 15/16" cylinder just may send too much pressure to > the R31's in the rear and you don't wont premmy lockup. With the big 4 spots > in the front you really don't want much more than 20-25% going to the rears > in a much lighter car than brakes of that capacity are designed for. I've > never used an Urvan cylinder but if it's a Tokico or Nabco with the lines > out on the correct side or even better underneath then it will be fine. > > regards > Terry > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Mark O'Conner > Sent: Wednesday, 29 May 2002 9:29 AM > To: [EMAIL PROTECTED] > Subject: Re: Brake Booster > > > I am intending on running 285mm R32 discs and R32 4 spot sumitomo > claipers at the front with R31 discs and 2 spot genuine nissan calipers on > the rear. > > What I want to achieve is a good feeling pedal without the need for a > bias valve. If I can find the parts required I want to then get them new. > > What is your opinion on the Sunny Booster and Urvan master cylinder? > Any other suggestions? > > Your assistance would be helpful. > > Cheers > > Mark O'Connor > ----- Original Message ----- > From: Terry Rudd > To: [EMAIL PROTECTED] > Sent: Tuesday, May 28, 2002 7:32 PM > Subject: RE: Brake Booster > > > Mark, > > What brakes (front & rear, discs & callipers) do you intend to run > as it depends greatly. I've not seen a lot (none actually) that have had > success with a 15/16" cylinder and the car I'm thinking of now has a 13/16" > Sunny and it's a good feel. I have no problem with the Sunny booster, it's > much the same as a Japanese 180B & SSS anyway. > > regards > Terry > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Mark O'Conner > Sent: Tuesday, 28 May 2002 9:36 AM > To: [EMAIL PROTECTED] > Subject: Re: Brake Booster > > > Thanks Terry, > > Im not too sure! I was told to go with a Sunny Booster and Urvan > Master (being 15/16th) > > Any thoughts or other suggestions? > > Mark > ----- Original Message ----- > From: Terry Rudd > To: [EMAIL PROTECTED] > Sent: Monday, May 27, 2002 10:12 PM > Subject: RE: Brake Booster > > > Mark, > > Do you mean 15/16" master cylinder? Sunny has 13/16" and same > booster as 120Y (11/16"), 15/16" cylinders are off 180SX and not much else > that I know of and SSS had some a while ago. > > regards > Terry > > > --membersozdat------------------------------------------------------ > - > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > -------------------------------------------------------------------- > - > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
